I've yet another module I am developing. It is a 1bit voltage controlled noise generator with sub-octave simultaneous outputs and voltage control of the pitch. It creates gnarly ass C64/chiptune sounding noise textures.

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!Last edited by HexInverter on Fri Jan 04, 2013 2:24 pm; edited 8 times in total

sounds good Hex
as usual i think i will want one.
You might need to slow down some , my cave is filling up fast . There's now over 200 boards in my backlog damn never enough time
Wish i could take a sabatical for a year or two and just build.
Oh well i always said this would last me till retirement to finish if i was lucky._________________In an infinite universe one might very well
ask where the hell am I
oh yeah thats right the land of OZ
as good an answer as any

No circuit diagram until it is done, sorry There are some evil people out there that will snap this up and make it into a commercial module if they think it's worth it._________________hexinverter.net -- Shop DIY projects and modules for modular synthesis

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!Last edited by HexInverter on Sun Sep 23, 2012 6:57 am; edited 1 time in total

sounds good Hex
as usual i think i will want one.
You might need to slow down some , my cave is filling up fast . There's now over 200 boards in my backlog damn never enough time
Wish i could take a sabatical for a year or two and just build.
Oh well i always said this would last me till retirement to finish if i was lucky.

200!? lol!!! That is a massive backlog xD

That would be a fun year or two!_________________hexinverter.net -- Shop DIY projects and modules for modular synthesis

I understand about the schematics, keep them secret, could you clarify one thing for me though: Is there a PIC or other programmable IC in it?_________________As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"

Indeed sir! There are other benefits too -- there is no aliasing on the CV input When you sweep the CV input knob, or feed a CV signal in, it is actually changing the clock (and thus, the pitch) in real time, in increments of one clock cycle (not aliased like with a microcontroller!)

Also, I am quite certain a microcontroller has different rise/fall times that effect the sound of the noise. I was comparing a similar noise routine I wrote on PIC to this CMOS circuit and they don't sound the same!_________________hexinverter.net -- Shop DIY projects and modules for modular synthesis

Better sound; Jolly good but could you define aliasing? I may know it by another name ..._________________As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"

Better sound; Jolly good but could you define aliasing? I may know it by another name ...

Aliasing is the "stepping" that occurs when reading (or generating) any analogue signal with a digital device (in this case, a microcontroller). Basically, the ADC (analogue -> digital converter) on a microcontroller is typically 1024 (10 bit) step resolution, so, as you turn the CV knob on a digital device, or input a control voltage, the device actually only has 1024 steps on the control.

This may sound like a lot, but it IS actually noticeable to the ear when you are talking about a VCO. You typically can hear faint stepping in the pitch coming out of digital VCOs that only use the built-in 10bit ADC. Of course, you can purchase and use a 12bit ADC to greatly increase the resolution you can read at, but, it's nowhere near as cheap. Already, you've probably surpassed the cost of the two (only) decently expensive parts on the non-microcontroller CMOS design...the two CD4006/NTE4006s _________________hexinverter.net -- Shop DIY projects and modules for modular synthesis

I see now all of the science has been explained, thankyou. Your circuit is really quite good then if it is making digital noise without aliasing, carry on the good work old sport _________________As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"

Very cool sounds and lovely PCB design. Wish I could afford the Eurorack boards as it looks like fun. Any chance you'd offer the PCBs without the SMT already mounted, for those of us comfortable with SMT soldering?_________________musicpcb.com

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